#18554C
Closest named color: Dark Blue Green (#005249). oklch(40.8% 0.063 181.3), rgb(24, 85, 76).
Aa
White text reads best on this color (8.59:1).
About this color
#18554C is a dark, muted teal or cyan. In OKLCH its lightness is 41%, its chroma 0.063 and its hue 181°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Green (#005249), ΔE 0.016 away. White text reads best on it, at 8.59:1.
| Hue family | Teals and cyans |
| Lightness | dark (41%) |
| Chroma | muted (0.063) |
| Temperature | cool |
| Nearest name | Dark Blue Green (#005249) |
| Black text | 2.44:1 |
| White text | 8.59:1 |
Values
| HEX | #18554C |
| RGB | rgb(24, 85, 76) |
| HSL | hsl(171, 56%, 21%) |
| OKLCH | oklch(40.8% 0.063 181.3) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #18554C | 8.59:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #18554C | 2.44:1 | Fails | Lc 14.7 | Not readable |
| #18554C text on white | 8.59:1 | AAA | Lc 89.3 | Fine for body text |
| #18554C text on black | 2.44:1 | Fails | Lc -12.9 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 800.
-
Step 50
50
#F2F7F5
oklch(97.2% 0.006 170.4)
-
Step 100
100
#E3ECEA
oklch(93.6% 0.01 181.4)
-
Step 200
200
#CBDEDA
oklch(88.5% 0.021 181.8)
-
Step 300
300
#A8C9C2
oklch(81% 0.037 181.1)
-
Step 400
400
#77ADA3
oklch(70.7% 0.059 181.7)
-
Step 500
500
#50998C
oklch(63.2% 0.076 180.8)
-
Step 600
600
#308376
oklch(55.6% 0.082 181)
-
Step 700
700
#216F63
oklch(49.2% 0.077 180.7)
-
Step 800
800 (this color)
#18554C
oklch(40.8% 0.063 181.3)
-
Step 900
900
#204A43
oklch(37.7% 0.049 181.2)
-
Step 950
950
#142B27
oklch(26.9% 0.03 181.4)
#18554C with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #51504C | 0.067 |
| Deuteranopia (no green cones) | #48494D | 0.064 |
| Tritanopia (no blue cones) | #005752 | 0.012 |
| Achromatopsia (no color) | #4C4C4C | 0.064 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18554C
#18554C
oklch(40.8% 0.063 181.3)
- #663B48
#663B48
oklch(40.9% 0.063 0.8)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #18554C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Green #005249 ΔE 0.016
- Deep Teal #00555A ΔE 0.024
- Dark Slate Gray #2F4F4F ΔE 0.029
- Dark Teal #014D4E ΔE 0.032
- Dark Green Blue #1F6357 ΔE 0.046
- Petrol #005F6A ΔE 0.050
- Spruce #0A5F38 ΔE 0.054
- Pine #2B5D34 ΔE 0.054
Use #18554C in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.